m68k/fpsp040/bugfix.S

6 |	relating to the Floating-Point Software Package (FPSP)
14 |     * the handler permanently to improve throughput.
17 |     * corresponds to FP0, bit 17 corresponds to FP1,
35 |    /* Note: for 6d43b or 8d43b, you may want to add the following code
36 |     * to get better coverage.  (If you do not insert this code, the part
66 |	 * Otherwise, we would have to include OVFL/UNFL handler
67 |	 * code here to get the correct answer.
80 |	/* Make sure that the cmdreg3b dest reg is not going to
115 |	 * Otherwise, we would have to include OVFL/UNFL handler
116 |	 * code here to get the correct answer.
130 |	/* Make sure that the cmdreg3b dest reg is not going to
172 | Simply branch to fix_done and exit normally.
177 | Test for cu_savepc equal to zero.  If not, this is not a bug
186 | cu src equal to xu dest or equal to nu dest.  If so, go to
187 | op0.  Else, or if opclass2, check for cu dest equal to
188 | xu dest or equal to nu dest.  If so, go to tst_opcl.  Else,
205 | Check for cu dest equal to nu dest.  If so, go and fix the
230 	fmovemx %d0,ETEMP(%a6)		|load source to ETEMP
249 | xu to complete.  Remember, the instruction in the nu
252 | restore the instruction from the cu to the frame and continue
254 | exceptional, we choose to kill the process.
262 | The cu savepc is set to zero, and the frame is restored to the
280 | It is necessary to isolate the result of the instruction in the
281 | xu if it is to fp0 - fp3 and write that value to the USER_FPn
304 | The frame returned is idle.  We must build a busy frame to hold
324 	fmovemx %d0,ETEMP(%a6)		|load source to ETEMP
340 | The frame returned is busy.  It is not possible to reconstruct
341 | the code sequence to allow completion.  We will jump to
342 | fpsp_fmt_error and allow the kernel to kill the process.
356 | Check for cu dest equal to nu dest or equal to xu dest, with
371 | xu to complete.  Remember, the instruction in the nu
374 | restore the instruction from the cu to the frame and continue
376 | exceptional, we choose to kill the process.
385 | The cu savepc is set to zero, and the frame is restored to the
406 | It is necessary to isolate the result of the instruction in the
407 | xu if it is to fp0 - fp3 and write that value to the USER_FPn
430 | The frame returned is idle.  We must build a busy frame to hold
459 	movew	#0x43FF,ETEMP_EX(%a6)	|to double +max
464 	movew	#0xC3FF,ETEMP_EX(%a6)	|to double -max
469 	movew	#0x3C00,ETEMP_EX(%a6)	|to double +min
474 	movew	#0xBC00,ETEMP_EX(%a6)	|to double -min
477 | The frame returned is busy.  It is not possible to reconstruct
478 | the code sequence to allow completion.  fpsp_fmt_error causes
479 | an fline illegal instruction to be executed.
481 | You should replace the jump to fpsp_fmt_error with a jump
482 | to the entry point used to kill a process.